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Thermal energy storage with phase change materials in solar power plants. Economic analysis
Journal of Energy Storage ( IF 9.4 ) Pub Date : 2021-09-11 , DOI: 10.1016/j.est.2021.103184
Cristina Prieto 1, 2 , Luisa F. Cabeza 3
Affiliation  

Thermal energy storage (TES) increases concentrating solar power (CSP) plant capacity factors, but more important, improves dispatchability; therefore, reducing the capital cost of TES systems is very important to reduce cost of energy and serve as an enabler for commercial solar power plants. After presenting the concept of a novel cascade PCM configuration of CSP and demonstrating it energy efficiency, it is needed to develop a thoughtful economic evaluation of the concept. The goal of this paper was to investigate this system through annual modelling, engineering procurement company price quotes, and levelized cost metric comparison with a baseline case, the commercial two-tank molten salt storage system. Simulation results show that this new PCM concept decrease levelized costs of storage. The baseline of using shell and tube heat exchangers for PCM storage offers a reduction in capital and levelized cost, but this paper also shows that there are further cost reduction possibilities, as shown in the scenarios presented here, such as thermal conductivity enhancement, encapsulation of the PCM, or modification of the material to improve its thermal properties. Therefore, although the basic shell and tube PCM system has been shown to offer a cost savings, the 1.8% reduction in LCOE may not be worth the risk of further development. The shell and tube system should be a jumping off point to more appropriate technologies. The variants studied are likely to yield cost reductions in cost performance quotient (CPQ) as high at 80% and in LCOE as high as 10%, representing an unprecedented and valuable avenue of CSP plant cost reduction.



中文翻译:

在太阳能发电厂中使用相变材料存储热能。经济分析

热能储存 (TES) 增加了聚光太阳能 (CSP) 工厂的容量因素,但更重要的是,提高了可调度性;因此,降低 TES 系统的资本成本对于降低能源成本并作为商业太阳能发电厂的推动者非常重要。在提出 CSP 的新型级联 PCM 配置的概念并证明其能效后,需要对该概念进行深思熟虑的经济评估。本文的目标是通过年度建模、工程采购公司报价以及与基准案例(商业两罐熔盐储存系统)的平准化成本指标比较来研究该系统。仿真结果表明,这种新的 PCM 概念降低了存储的平准化成本。使用管壳式换热器进行 PCM 存储的基线降低了资本和平准化成本,但本文还表明,还有进一步降低成本的可能性,如此处介绍的场景所示,例如导热性增强、封装PCM,或对材料进行改性以提高其热性能。因此,虽然基本的管壳式 PCM 系统已被证明可以节省成本,但 1.8% 的 LCOE 降低可能不值得冒进一步开发的风险。管壳式系统应该是更合适的技术的起点。所研究的变体可能使成本绩效商数 (CPQ) 的成本降低高达 80%,LCOE 的成本降低高达 10%,代表了 CSP 工厂成本降低的前所未有且有价值的途径。

更新日期:2021-09-12
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